Improvement in reflecting-lanterns



E. BOESCH. Improvement in Reflecting-Lanterns. N0. 132,433. PatentedOct. 22,1872.

O 1 Q i V' =sses Inventor m J v @g m e v FFICE.

EMIL BOESCH, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN REFLECTlNG-LANTERNS.

-Specification forming part of Letters Patent No. 132,433, dated October22, 1872.

To all whom it may concern:

Be it known that I, EMIL BoEsoH, of the city and county of SanFrancisco, State of California, have invented an Improvement inReflecting-Lanterns; and I do hereby declare the following descriptionand accompanying drawing are suficient to enable any person skilled inthe art or science to which it most nearly appertains to make and use mysaid invention or improvement without further invention or experiment.

My invention relates to that class of Ian terns which are used forthrowing an intense light in one direction, such as mining-lamps,locomotive head-1i ghts, and the like. My lantern is intended moreparticularly for lighting up a bank of earth in hydraulic mining duringthe night, in place of the usual bonfire or cord-wood light. My improvedreflection-lantern is so constructed that while a most brilliant andfar-reaching light is produced, every part is provided with a freecirculation of cool air, and sufflcient means are provided for theescape of the heated air so that no part will become unduly heated.

In order to more fully illustrate and explain my invention, reference ishad to the accompanying drawing forming a part of this specification, inwhich- Figure l is a perspective view of my lantern. Fig. 2 is avertical section.

A represents the body or outer case of the lantern, which is representedin the present instance as having the main body made square, with theflaring projections 12 on each side so as to form a front or faceopening of the desired area. Inside of this flaring face I place areflector, C, which consists of parabolic sections united together attheir edges so as to provide a reflector of the desired concavity. Atthe inside center of this reflector I secure a small centralfocus-reflector, D, which can be adjusted up or down as desired, inorder to change the focus of the light without changing the level of thelantern. In order to render this small reflector adjustable a circularplate, 61, is secured just back of the main reflector C, and this plateis slotted vertically at its center, as shown, and a stem, 6, on theback of the reflector D, passes through this slot and is secured by anut, f, on the inside of the lantern A, and at the back of the circularplate. Directly beneath the reflector D a portion of one of the sectionsof the reflector C is cut away so as to provide a space of sufflcientsize to admit the lamp into it, thus permitting the light to be broughtclose up to the reflector D, by which a greatly intensified light isproduced. This opening also supplies air to the lamp. A slot, g, is alsomade through one of the sections of the reflector 0, directly above thereflector D, through which the chimney h of the lamp can pass, and thusbe in line with the chimney-top I of the lantern. This slot extends fromjust above the center reflector C, thus providing an escape for the hotair, which generally lodges above the lamp and is the cause of breakingof the glass front but also allowing the lamp J to be drawn out in ahorizontal plane when it is desired to remove it from the lantern. Theentire space behind the reflector and inside of the square portion A ofthe lantern is open and forms two air-chambers, a partition above thehole which receives the lamp dividing it horizontally into twocompartments. The low er air-chamber, which also serves as a stand forthe lamp, has a raised base-plate which connects with the lower edge ofthe opening in the reflector, and which serves as a slide to receive thelamp. A space is left around the lamp so that the air can pass in aroundit and feed the flame. The lamp can be moved back and forth along theslide so as to give the light a different range, as desired, byapproaching it to the focus-reflector or drawing it away. Without thepartition the air which enters the lower chamber would rise and pass outthrough the chimney, leaving the flame of a red color, owing to the wantof air. The upper air-chamber is also perforated, so that the hot airwhich passes through the upper slot in the reflector in this chamberwill be diluted and cooled, while it does not interfere with theordinary draft of the lantern-chimney, which is used merely for thepurpose of draft and carrying away the smoke from the lamp. The frame inwhich the glass front is secured does not fit snugly inside of the outeredge of the flaring face; but a small space is left elit-irely aroundit, through which the cool air can pass, while the space is protectedfrom the wind and rain by the overhanging edges. The circular plate atis set sufficiently back from the back of the reflector to permit thecool air to circulate freely between it and the reflector, so that thereflector is kept from beingoverheated. The chimney I is contracted. atits top by an inclining or conical flange, K, and a cap, L, is securedover it by a double-bayonet lock. This cap also has an inclined orconical top, at the apex of which an inverted dish, m, is secured. Holesare made in the conical top. under the inverted dish, and also beneaththe projecting rim on the sides, through which the draft escapes to theopen air. By this means the holes are protected from rain and wind, anda deposit of soot prevented, which usually covers the under side of thetop of the cap, and falls down through the lamp-chimney upon the flamewhen no openings are left at the center of the top through which it canescape to the outside. This cap is not only made removable for cleaningit inside, but also for regulating; the draft when require d-as, forinstance, when there is no wind the cap is raised until the pin entersthe lower angular slot of the bayonet-joint, thus giving a strongerdraft; but when the wind is high it should be crowded down until the pinenters the upper slot. By this means the wind has no chance to get downinto the lamp. An opening, a, is left in the back of the lamp-body A,which is covered by a cap, as shown, so that by removing the cap thefocal-reflector can be adjusted and changed without soldering. The glass0 which forms the door of the lamp is secured in the door-frame in thefollowing manner: The lower half of the frame is provided with a grooveon the inside, which is formed by turning up the metal rim of theframes. The glass face is then slid down into the groove and the upperhalf fastened by short metal strips. These strips have one end turnedover the outside plate 19, thence they are bent around under the frame,and up inside of it over the edge of the glass, and then down, so as toprovide hooks to keep the glass in place, thus permitting of their beingchanged when broken without soldering or expense. By bending thesestrips upward the glass will be freed and can be removed.

By this means I provide a reflecting-lantern which can be employed inhydraulic mining, as head-light for locomotives, and in many otherplaces.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut is--- 1 The reflector 0, consisting of the parabolicsections, in combination with the adjustable focal-reflector D,substantially as and for the purpose above described.

2. The combination of the reflector G, having the openings for theinsertion of the lamp, as shown, with the adjustable focal-reflector Dand sliding adjustable lamp J, as described.

3. The chimney I with its contracted upper end, in combination with theadjustable cap, perforated as described, for the purpose specified.

4. The manner above described for securing the glass in a frame,consisting of the removable metal binding or hook strips, applied asdescribed, for the purpose specified.

In witness whereof I hereunto set my hand and seal.

EMIL BOESOH. [L. s.]

Witnesses:

J. L. BOONE,

O. M. RICHARDSON.

